US PATENT SUBCLASS 104 / 57
.~.~ Rotating

Current as of: June, 1999
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104 /   HD   RAILWAYS

53  DF  AMUSEMENT {25}
56  DF  .~ Helical {1}
57.~.~ Rotating

DEFINITION

Classification: 104/57

(under subclass 56) Apparatus in which a helical track rotates, and thus causes the car to move by gravity, similar to the action of the Archimedean screw.